EFFECTS OF ADDING VARIOUS OILS TO THE DIET ON GROWTH, FEED CONVERSIONAND CHEMICAL-COMPOSITION OF CARP (CYPRINUS-CARPIO)

The suitability of various vegetable and fish oils was tested as feed components for one-summer-old carp fingerlings. Five diets were used: a basal diet, which served as control feed, was supplemented with 10% corn-germ oil, 10% sunflower oil, 10% fish oil or 10% rapeseed oil, re spectively. By means of the lipid supplementation the crude protein co ntent decreased from 35.5% in the basal diet to 31.9% in the test diet s, whereas the gross energy level increased from 16.3 to 18.9 MJ/kg. T he diets were fed over a period of 84 feeding days and water temperatu re was 23 degrees C. Weight gain, feed conversion ratio and protein ut ilization were superior in all groups of carp which received the fat-e nriched high energy diets. Considering the gain in % of the initial we ight, the control fish reached less than 400% whereas all carp in the test groups, which consumed the oil-enriched diets, reached 455 to 485 %. A significant influence of the kind of lipid on growth and feed con version could not be recognized. The lipid-enriched diets with higher energy content resulted in increased fat levels of the carp. Fatty aci d composition of the carp reflected that of the diets. In the control group and the fish oil group the levels of palmitic, palmitoleic, eico sapentaenoic and docosahexaenoic acid were especially high correspondi ng to the fatty acid profile of the diets. In carp fed the diets suppl ied with corn-germ oil and sunflower oil linoleic acid was dominant wh ereas the carp fed the rapeseed diet were characterized by a high leve l of oleic acid.